Mathematics is the study of mental objects with reproducible properties.

-David Mumford

Sir, I have found you an argument; but I am not obliged to find you an understanding.

-Samuel Johnson

I had a feeling once about mathematics -- that I saw it all. Depth beyond depth was revealed to me -- the Byss and the Abyss. I saw -- as one might see the transit of Venus or even the Lord Mayor’s show -- a quantity passing through infinity and changing its sign from plus to minus. I saw exactly why it happened and why the tergiversation was inevitable but it was after dinner and I let it go.

-Winston Churchill

Language was invented so that people could conceal their thoughts from each other.

-Charles-Maurice de Talleyrand

An expert is a person who has made all the mistakes that can be made in a very narrow field.

-Niels Bohr

An expert is a person who has made all the mistakes that can be made in a very narrow field.

-Niels Bohr